Alfred h



(NOMOdel.) I 'I A. H. MOSES, 'JI. ELECTRIC ARC LAMP.

I/ /NVENTOH MJW# ATTORNEY W/TNEssEs:

PETERS co. Puoouma. /Asnmarau. n. c.

UNITED STATES PATENT OFFICE.

ALFRED n. MosE's, JR., on NEW YORK, N. Y.

ELECTRIC-ARC LAM-P.

SPECIFICATION forming part of Letters Patent No. 528,642, dated November6, 1894.

' Application filed January 8, 1894- Serial No. 496.039. (No model.)

.To all whom it may concern:

Be it known that I, ALFRED H. MOSES, Jr., a citizen of the UnitedStates, and a resident of New York city, in the county and State of NewYork, have invented kcertain new and useful Improvements in Electric-ArcLamps, of which the followingis a specification.

My invention relates to an improvement in electric arc lamps, and it hasfor its object to provide a means whereby the globe of the lamp may beexpeditiously and conveniently dropped or removed from the carbonsoreleotrodes to expose the latter, the globe remaining at the Ysame timein connection with the lamp.

A further object ofthe invention is to provide a means whereby the globeof an electric arc lamp need not be removed from its support when theglobe is to be lowered, and whereby the globe and its support may becarried upward to an engagement with the casing, or to its normalposition in an exceedingly expeditious manner,the connection between thecasing andthe globe being a thoroughly air-tight one.

Theinvention consistsin the novel construetion and combination of theseveral parts, as will be hereinafter fully set forth, and pointed outin the claims.

In the drawings, Figure 1, is a partial side elevation and partialvertical section through a lamp having the improvement applied, thesection being taken essentially on the line l-l of Fig. 2. Fig. 2, is aview similar to Fig. 1, the section however being taken at right anglesto that shown in Fig. 1, and practically on the line 2-2 of said figure;and Fig. 3, is a plan view of the lock nutemployed upon the lamp.

In carrying out the invention the frame of the lamp consists preferablyof parallel bars 10 and 11 which at their lower ends are carried inwardin a horizontal direction and se' cured to the upper end of Aa tube 12,in any suitable or approved manner, the tube being located aboutcentrally between the two bars and pendent therefrom. The lower end oflthe tube 12, which may be of any desired length, is closed ordinarily bya plug 13, as shown in Figs. 1 and 2. The lower carbon or electrode 14,is passed into the tube 12 through a spider-like socket 15, the carbonor electrode being held in the socket through the medium of a set screw16, or its equivalent.

A casing 17,preferably of metal, is secured by means of screws orequivalent fastening devices tothe upper portions of the frame bars 10and 11, the said casing 17, being provided at itsv lower edge withl ahorizontal flange 18 preferably made of greater thickness than thatofthe body of the casing, and the liange 18 has a washer or gasket 19,of rubber, leather or like material, preferably permanently and securelyfastened toits under face.

The plug 13 when it is employed to close the lower end of the tube 12,is provided with a head 13a, whiehextends beyond the sides of the tube,and the tube ordinarily about midway between its ends is provided withan exterior thread 20.

The globe 21 is adapted to engage with the washer or gasket 19, of thecas/ing liange, and to be normally held against said washer in suchmanner as to forni an air tight connection with the casing, and thelower portion of the globe is made to rest upon a support 22 adjustableor movable vupon the casing. This support usually consists of a tubularbody section 22a, a horizontal bed section 22D, integral with the topofthe body section, and an annular fiange 22C located at the margin ofthe bed section, extending upwardly therefrom; and awasher or gasket 23is located upon the bed section ofthe support, adapted to receive thelower edge of the globe. A look nut 24 shown in detail in Fig. 3, islocated upon the tubular portion 12 of the frame the said lock nut beingadapted to slide over the unthreaded or plain exterior of the tube andto be screwed upon the threaded section thereof. The elastic washersserve to afford relief to the globe when expanded by heat, besidesmaking the joints tight.

In operation the support rests upon the lock nut 24, and the bore of thesupport is sufficiently large to enable it to pass readily over thethreaded section of the sleeve. Therefore, when the lock nut is screwedupon the threaded section of the sleeve, the support 22 and the globewill beV forced upward until the yupper edge of the globe has a drm andair-tight connection with the flange 18 .ICO

of the casing, and the said flange is rendered thicker than the body ofthe casing in order that the iiange 'may stand firmly against a maximumpressure. Vhen access is to be gained to the electrodes or carbons, thelock nut is unscrewed from the threaded portion of the frame sleeve 12,and will drop downward upon the sleeve to an engagement with the head13a of the plug 13, which acts as a stop, and the support, carrying withit the globe 21 will follow the lock nut in its downward course, andwill leave the electrodes or carbons exposed to such an extent that theymaybe freely reached, replaced or removed, and at the same time theglobe is entirely out of the way but yet remains upon the frame of thelamp, and when the carbons have been manipulated as desired by pressingupward the support and lock nut and screwing the lock nut on thethreaded portion of the frame sleeve, the globe will be restored to andsecured in its normal position. In order that the lock nut may beoperated conveniently, it is preferably provided with a series of pinsor studs 25, which project from its peripheral surface.

It will be understood that the adjusting device for the globe of thecasing above described may be applied to a double arc lamp as well as tothe single form illustrated. Vhen the double formv of lamp is employed athird pendant or extension of the frame may be located between the twotubular extensions receiving the carbons or electrodes. In this eventthe support for the globe will slide upon all three of the extensions,while the lock nut may be made to travel upon the intermediate extensiononly.

To provide against accumulation of undue pressure within the lamp thatmay possibly occur by the slight combustion consequent to the oxygencontained in the lamp at the beginning, or any other cause of suchpressure, an ordinary relief valve is provided at 26, in the case, saidvalve adapted to open at any desired internal pressure above atmosphericpressure and permit escape of the gas.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In an electric arc lamp, the combination,

with the frame, a pendant of the frame provided with a stop at one en d,and an exteriorly threaded section, the surface of the pendant beingplain between the thread and stop, of a casing attached to the frame andprovided witha ianged lower edge, a support having sliding movement uponthe pendant of the frame, a globe located upon the support and adaptedfor engagement with the liange of the casing, and a lock nut locatedupon the pendant and engaging with the support, whereby the support andlock nut may be moved together and a tight joint may be obtained betweenthe globe and support and the globe and the casing, substantially asdescribed.

2. The combination of the case open at its lower end and said endHang'ed suitably for making a joint thereat with the top of the globe,the pendent portion of the frame, the

globe support adapted to slide up and down said pendent portion-of theframe the globe adapted to be clamped between the globe support and theflange of the case, and the lock nut on the pendent portion of theframe, and adapted to clamp the globe support, globe and the flanges ofthe case tightly together substantially as described.

3. The combination of the case open at the lower end and said endflanged suitably for making a joint thereat with the top of the globe,the pendent portion of the frame, the globe support adapted to slide upand down said pendent portion of the frame the globe adapted to beclamped between the globe support and the Ilange of the case, a packingof elastic material for the protection of the globe and the lock nut onthe pendent portion ofthe frame and adapted to clamp the globe support,globe and ange of the case tightly together, said globe and case beingpractically air-.tight and provided with a relief valve substantially asdescribed.

Signed at New York city, in the county and State of New York, this 27thday of December, A. D. 1893.

ALFRED 1I. MOSES, Jn.

Witnesses:

W. J. MORGAN, S. H. MORGAN.

